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JavaScript Functions

Define a function

To define a function you use the function keyword. You give the function a name and any arguments you might have.

    function firstFunction(argument1, argument2, etc){
     [statement(s)]
    }
   

Even if the function does not have any arguments, it MUST still have the parenthesis after the name.

    function firstFunction(){
     [statement(s)]
    }
   

Arguments are variables used within the function, they are set when they are called. If a function is placed in the head section of the document, the function will be loaded as soon as the page starts before the function is called

Calling a function

Too call a function you simply type the name of the function along with or without its arguments

  	 firstFunction(1,2,3)
  	 or
  	 secondFunction()
  	

The return statement

Function's which return a result must use the return statement in order for the variable's result to be passed to where it was called from.

  	 function multiplyIt(2,3){
  	  var answer = 2 * 3
  	 }